Electric contact breaker



April 20, 1925. 153138@ A. J. H. ELVERSQN ELECTRIC CONTACT B-EAKER FiledAugust l1, 1922 Patented Apr. 20, `1926.

UNITED STATES PATENT ioEEicE.

ARTHUR JOHN I-IAWES ELVERSON, OF LONDON, ENGLAND, ASSIGNOR TO HERBERTKENNEDY & COMPANY LIMITED, 0F VIESTMINSTER, LONDON, ENGLAND.

ELECTRIC CNTAGT BREAKER.

Application filed August 11, 1922. Serial No. 581,251.

To ZZ whom t may concern.'

Be 1t known that I, ARTHUR JOHN HAwns ELvEusoN a British sub ectresiding at The a. ,l i a Lvnch Clirton Road nnbledon London c 7 2 a 7S. lV., England, have invented certain new `and useful Improvements inElectric Con tact Breakers, `of which the following is a specification.

This invention relates to electric contact breakers. l

An object of the invention is to provide an improved electric contactbreaker of the flat spring type which is so damped as to enable itsuccessfully to operate at high speeds.

A further object is to provide an improved construction wherein a springis supported or anchored at two points near the ends thereof and theoperating member and contact are arranged at points intermediate thepoints of support, thus enabling the Contact breaker to be operated athigh speeds without setting up troublesome vibrations.

The invention consists in the improved Contact breaker comprising thearrangement and combination of parts hereinafter described and claimed.

Referring to the drawings z-f Fig. l represents an elevation, partly insection of the contact breaker and Fig. 2 represents a plan viewthereof.

The flat spring a is anchored or supported at one end by a screw oagainst an insulated support c and is engaged at the other end by adamper (Z taking the form of a plug of insulating material which is adjustably secured by a screw e in the split end of a support f.

The spring normally contacts with a screw f/ which is adjustably securedby means oil a nut c' in a bar 0, a platinum contact 7iy being securedby riveting or other suitable means to the spring a.

lontact is broken by an operating member comprising an insulated stud 7cmounted by a plunger y' operated periodically, usually at high speed, bya cam or like mechanism.

The stud is normally held out of contact with the flat spring i by meansof a helical spring m housed in a socket Z mounted on the bar 0, thehelical spring bearing at one end against a shoulder 79 on the plungerand at the other against a screwed ringa.

The contact-breaking spring e is preferably of phosphor bronze and isprovided with a second leaf, al extending from the end secured to thesupport c to the point of contact of the operating member.

The arrangement described allows the contact-breaking spring to be verylight and by suitable positioning of the operating member and contactpoint the movement of the spring at the contact point can be madesmaller or larger than that at the operating point.

I claim:

l. Electric contact breaking apparatus comprising the combination of aflat sprine, means to anchor one end of said spring, an abutmentpressing upon Vthe free end of said spring, a fixed contact, a secondcontact up-` on said spring normally engaging said xed contact, aplunger operable to press said flat spring away from said fixed contact,said contacts being disposed between the said plunger and the said freeend of said spring. 2. Electric contact` vbreaking mechanism comprisingthe combination of a fiat spring means to anchor one end of said spring,an abutment pressing upon the free end of said spring, a fixed contact,a second Contact upon said spring normally engaging said fixed contact,a plunger operable to press said fiat spring away -from said fixedcontact, said contacts being disposed between the said plunger and thesaid free end of said spring, and a second flat spring anchored at theanchorage of said first spring, pressing on said first spring upon theside remote from said plunger and terminating adjacent said plunger. 4

3. Electric contact breaking mechanism comprising the combination of aflat spring, means to anchor one end of said spring, an abutmentpressing upon the free end of said spring, a fixed Contact, a secondcontact upon said spring normally engaging said fixed and a springnormally holding said plunger away from said flat spring.

4. Electric Contact breaking apparatus comprising the combination of aflat-spring, means to anchor one end of said spring, an abutmentpressing upon the 'free end o1'L said spring, a fixed Contact, a secondContact up- 0n said spring normally engaging said fixed Contact, aplunger operable to press said `flat spring away from said fixedContact, said contacts being disposed between they said plunger and thesaid free end of said spring, and means to adjust the said abutmentrelzv tively to said spring.

ln testimony whereof I aflix my signature ARTHUR JOHN HAWES ELVERSON.

